Type AUK 2 tap gap is suitable for low risk installations (no greater than fluid category 3). It is a specific minimum distance between the lowest point of a tap spout, shower head or other fitting and the spillover level of the low risk receptable it supplies.
A Type AUK 2 tap gap is rated by the Regulators as suitable backflow protection against contamination risks no greater than fluid category 3 but for back siphonage only.
The requirements for a Type AUK2 tap gap are:
The tap gap is measured vertically from the lowest point of the outlet, which includes any aerator or flow straightener fitted, and the spillover level of whatever receptacle it supplies.
The gap required will vary depending upon the connection size of the tap or combination fitting as given below:
Connection size
Not exceeding ½“
Exceeding ½”but not exceeding ¾”
Exceeding ¾”
Tap gap
≥ 20 mm
≥ 25 mm
≥ 70 mm
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